Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/8df6609923a2
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #11900 from huchengtw-moz/camera/Bug_896874_there_is_no_tone_when_start_stop_recording

Bug 896874 - [B2G][Helix][Camera]There is no tone when start or stop a v..., r=djf, r=archur

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https://hg.mozilla.org/integration/gaia-central/rev/6a8e3d1a8db8
Author: John Hu <johu@mozilla.com>
Desc: Bug 896874 - [B2G][Helix][Camera]There is no tone when start or stop a video recording